A schematic of how you had hoped to use the TL071 as a comparator would help.The reason I wanted to use a TL071 was because I'm already using one for an audio-preamp in the same circuit so using a dual pack would save money and space. Basically I'm trying to just have some sort of configurable indicator as to when the output of the pre-amp is past the safe threshold for what it is feeding to. As a sort of clipping indicator. Might there be another way of doing this by placing an LED/resistor in parallel with the negative feedback resistor on a non-inverting op-amp? The only issue would be tuning the LED turn on voltage.
Yeah, I had considered that but I wanted a solution that would take the least number of chips so sticking another coupling cap and resistor divider seemed a little too excessive.Another option is to shift the signal and reference slightly upwards (1V or something) so it fits in the input range. Depending on how you sense the signal level, could be as simple as tying a resistor divider to the +V rail instead of ground.
by Aaron Carman
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